Fixed.
Eesh, I don't know what you mean by 'effective' offense but I disagree with this. I was really impressed with Dillashaw's variety in his offense. When he was in Orthodox, he worked his jabs from three different distances (no step, step, and then that lunging quasi-superman punch) but he also threw a lot of lead hooks and uppercuts to Barao's body. His biggest shots (the huge one in the first and a few in the third) came off feigning those jabs and throwing them overhands (correctly). He also had that great feign-the-takedown-then-uppercut combo which nailed Barao several times, and once or twice he was successful just throwing the rear uppercut without setup at all. He also landed dozens of leg kicks throughout the fight, and even began landing a consistent switch kick in the later rounds. And that was all in Orthodox. When he switched to Southpaw, he actually didn't jab much at all-- most of it was straight lefts, followed up with hooks when Barao avoided it by going straight back--- plus Dillashaw worked his kicks to the body beautifully on Barao's open side. Midway through the third and onward he started throwing a lot of right hooks from Southpaw as well. Leg kicks too, both rear and lead.
And as you mentioned, that straight left to left high kick combo worked wonders.
It was also just hard to keep track of when he was in Orthodox or Southpaw because sometimes after a rear punch, he'd pull back and other times he'd step forward and seamlessly be in another stance. That's offense in itself, real unique offense too.